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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f38c56b633ff9708826f3567ec2d2ffdf25d95516ca9c6b2b538df4b1a5f115' 
  AND token = 'LEsNJXxwzkhvnaXqxk3F7Oko1y+fxhKK+nD9jSe6PSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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