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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '649d2c3cbb4c71edf858e8914e0aeb96c91fd653c9d38eb5722b2919e99a5298' 
  AND token = 'qPyJAe44hr7UCNLVFp4yJ+DDywrp1HNbxBs5vESIW3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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