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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7b5c39e09831c8f2442af6f59dfa02347348ef7302ef2ea5d4ffd5ed0e1104' 
  AND token = 'oVBhJDkcZB6HsTCrd6xixMhqP4uYJkFfd9OTsj5TYZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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