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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d80b949cad5b022ff5042e493600b7dc6bed03f9745e84cc64c46ac73f790d' 
  AND token = 'rwQlhU/4Ury0mar1W3MlTwjPFvxox8bzYL+4kGznS2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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