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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebe40d52e9dc7a434cf119e7868c89dc5dacf1f6ebea68886ecedc2415a63f4' 
  AND token = 'TVbAjU5Q7bJNF21aDnq3coMvxXXsDKlURlTJf+k8DtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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