SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230ffe847f8ef65492caf37524cbacd22885ee8ceefd0554bd3413911d5f6968' 
  AND token = 'NOQnLX2MUjFKkPz166wIqOgedGUiMHDfvVGNg/jIavs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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