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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df455f4e5464ba8eb10eeaec5066b52cbb95bcd84a4127a1c012f0fe2e5bfe3e' 
  AND token = 'ed8pXHc9nm6Z0d4rN201iIp4ikXznn1tCbJBLVdJBSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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