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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4472c59b793d51184ca528fb5976d2d64320fba1828fd56bb0f9034d43041a0' 
  AND token = '2BMLWd6s5e1bM9HuylqUzBNU8dwGU9Z4M8FqejbNxwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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