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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38de06ebfa0ac0b98681aaf0ff2279896996d79131a5a0a035321466299681be' 
  AND token = 'u9rdQOOV+ATfWDtqpPn1sIr7Ej0Yo450JByX6QF291s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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