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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2efd7a227bcfa33a5f588a85c4d317b196f3bc96c7621ae9b85295bbdd2ff6f' 
  AND token = '8h8Z/82qkOweiKnZRaLHm8bcN1Ij9z2kJtqY/y2jLQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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