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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36080f4a68d2f0945752e9342f84b7dcccfa3d1400dc8debb11d07ea19c847d6' 
  AND token = '7vdm+tFfIdeU2DENrXyKLNqc1ESxQsJBvLLjmOu366Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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