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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a01c57d9313f6e96527437f3e81d8b6fa0bc8030c1ffeec3e3b95fb8e15294e' 
  AND token = 'SI7/75j69twcF2SWsTxobjjuvgT/z0yZTn8pqY98qyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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