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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16705044348b1bd46c8c5a9e01da884a2c3415ba9bb1222ec0c6e807a8d8c0b3' 
  AND token = 'BBTczLt2n7c6jF8qpT5Vobiq2wHgA79LvLeraShvJd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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