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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e3d20b7b28a6f29903d4b63a8832a9415e33ad20aabac813dc6785b0b4f6e3' 
  AND token = 'atJs9iSFgciNbdNRNRytj7nEY2LRNr2C6Yu7vwnFKY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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