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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71c6380be1ac8f2f4a6da3218c4f48c8045f05359813b4519c35290c81e0b72' 
  AND token = 'SjmA0LT28YacuDSo75McVSh4tzjeqlTIQfeqGqXg4Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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