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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19e4bc3c6f5c476fa8fced268d58b7a701f1479343d4d5813d5be2cc6c7ec44' 
  AND token = 'O9B8BMrCMf0lnmtHoIqpfYNXRy0dusrieUeC/1zreyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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