SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096c79c5e578ac1ac0b5e42cea2da991af58175231e4b4f94f28977200b6f73d' 
  AND token = 'HKYRotoaGz8ok/vhmlUvWHwggB4RtC+7+J5kPjADa+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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