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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a320f6331d8d92379be22feb9b93e88a92aaacfdc3c7ceb2c9d0a313947fa5' 
  AND token = 'mBY9As+kJ/pQW9qPNm4QTNOWdiADFGMGsMbZw5Xqn9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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