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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1d411492b7a2dc574e89fb9d5c541de2db81d222b0bc2e7a38e7bd90bc4994' 
  AND token = 'Vn9aVl3WkNbYdgIx+2atb1DpR+XtGcwNqKkgOCfUvtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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