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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0549e232548543cd27197732fbb52a489c925d18447c8eb02bfd152e70516bc2' 
  AND token = 'pJoPJO58kL3pNe+E5Hf/xTQJ0QXHVWic+Q0JabvrbOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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