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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d72c0b85c61b8fbbdfaca7b84ba300aeeb244ccfdf5eb35bcd98cb3bc66d9f9' 
  AND token = 'vs9toZevf27TWgK98euDa0uyquY3AzaJVZOPJa6ot74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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