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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facb01b5780eb3bce3489e80d06ba26258309649ccdc01b880e0a9649423c0a4' 
  AND token = 'ldOSgIkqzQNq7hywKdGJA3bWRJWkvd67P93agD9EfGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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