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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d1e7f2b320627ec00c067bac8185e8fda1d67ac12c0c6b41af2635dc534acc' 
  AND token = 'Jv4M8dwyouc6qoAR+ftnaUBmIDjFblsACH3ZOa/Q9wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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