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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bc5c9fdb564b5edac49f829169a5124407d5aad6c83042e7c1ec1ec6e5d42a' 
  AND token = 'o7fHu5mKzQCD6HTgArgmJShxbeBcXMjYW8ifR0JLcro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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