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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae0cb33a99b9c199c33e812b1acfefe26b279cc4dab807a7a533d90acce7f84' 
  AND token = 'bYFCEWes9+fEb06Cj47S/4NztnipMi51XWoimETAlgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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