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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c53b82a21cd2467c5fd2319825f5a04cc95a81e6479c2e0df5220fc18702bcf' 
  AND token = 'dtxjlkp0cNui8pTYlk2V/4zU4f26WRdkHxqkM5vn8hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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