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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8cfff105d23c17f3d4b51dd081d8b4715f1744b4585de6f323a96237e663a1' 
  AND token = 'S8H/yiKp5coeOlhGdd5zuPUfYC/o9mN9mVP7CJpWFpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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