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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09dc89a175788724e2d95152a0b708daa16f94df9cb435c8101a2a10c8a7d7ba' 
  AND token = 'iXRiE/0dukJcTAouFWSd5+O2kk6FHUJYZhvyC+9I88Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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