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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4698eaafc976f3c1af13ddd9cd7b6e46d55cff58d67450138f469ee99071360e' 
  AND token = 'bcNICsI7Z0PJpb9pUNsZeDz0Sz6wAlOXTUVJIky8SvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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