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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff039c0602e7cb31c8d22a94e430b37950011f68fb3af2231febe7d6403cf34' 
  AND token = 'TGrlefIxulMdLYXkLoroRAcVzd20H66KOiQDEsRP6Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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