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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1bb939ab65c83b53947a2bf7e36c4e86c08fbd5ad6208a4f0577e796a6ced8' 
  AND token = 'huowXUzdp5vQAfM1NaYI/E7IWwFtVNdH5x3ESJoKXT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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