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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5fc9ca835f2b2108246961076f9459f2ff51c564e7cbb6e2cf1d383dff34cf' 
  AND token = 'g8c/ocrBNyBFTI/DxtuUOiy1nT3PyQ4dilyYEVhUTTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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