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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8051b2eb00b8f8791912178145353affa4b92002be1e2378310cba1c17e79c5' 
  AND token = 'xY8mKt28P/erX4cu9i9PkpyOfvszInDMh8sIA12uMbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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