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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb1677a966d13f3632b0572bd7371682c9aab5cd3ef21c8ca5450c478243c43' 
  AND token = 'bf1kynQ+YTVabNE+t0tVIlhLd44bkBOMGS0mnM5nP6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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