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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfbef63ec67781f58fc73d1130efd9e2c478d5ae29bde8d4ad2b83f04e94c4d' 
  AND token = 'Pnyfzo2BgC/Mn7EwB3r5eQbsRJeWoV/Rs/+3HwFbZDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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