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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3c24bddb4514f72176d858fe3a93f64e70e6f3454cf7557f15b0d428c7b5ad' 
  AND token = '4lex8xFgB51E6FLPnqkZKeMx+3yThPfVQImULKxzh8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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