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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99eeb0195512531f2116327a0491988b43ba948496f79a4cd07596b46cf4724d' 
  AND token = 'nvpiQkwtOQp6bG630BWX+BTOkUlLPFMoEbAjjPXTb/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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