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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04a0af6964508c2db818a382b07d85d992b384b3c8ce6fae05354dca6f43838' 
  AND token = 'aKqMr19x2Sqd7Hdf48H50wUrACMCZJjjdhRQLQYs+cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}