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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bce885a5221bb311c83211f99970d98eeb5e3bc25b152a88e2fbe16af2a6f3' 
  AND token = 'FjrvC86ovUhxiGTzBDbNCJ2xO4SgQc+FtRUmR49ba40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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