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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acaa3f117283f978c62bc84b0f73c35171b0d4c106f10f712ad7a87965b33ea' 
  AND token = 'VD0BDwPf0goQf3ro38YWvTjDHRV0F6GbnKmvv5vZI7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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