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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8c31ba86537f34035e84a3ced64775146ef1b7b854c60c55be3b9ebbfb077a' 
  AND token = 'Oyj7/OAPfxKTzQam2Y0L9k35knLv1qr14a6t5T9ykEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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