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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f954b363c8c8d340b58d85cba03016d002e9591bc0c32afbc3de1704b324201f' 
  AND token = 'JMZ6/T2ht9SrLr4FoMa2167Xousv0durXBT2NgXxg/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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