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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f80492dde698f8292bb3049b605e14a4816ed3b4d13094d09ee047868f9156' 
  AND token = 'nDJK5FrIUSOv1QX25X+oCUrtoSMY2pAFos0xgKT3XXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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