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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b14b63c53b5218eaf0fdbbcc82c66eb0d29c0e9b316124dcdad208dd17ab2e' 
  AND token = 'VD+XleZDObyKG5ahuTOIiqLW1unqRLVKrPpA8tI/dfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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