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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042f602a0a8fe5df9c9b4903aba0f498414496b381037a156eaec7733898c3ba' 
  AND token = 'ypWgJ5bhtKN6+zvnA0HO6IA4C6Zz8UwNLU1mzQ9N0m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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