SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293c47013714e18f9f665c04f5d7e1de7259e507949bfc69f2a0eadb39b04a0e' 
  AND token = 'fJVwnN/SOH1wbK1iAmqMbjRGwZ81RzpgpGPM/wGrYBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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