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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3f0c868404db4320c47e9f6e833d5ba8adb3feff5955772324a166863b22c9' 
  AND token = '8/SYS0LGJar14c0RZe7dThn9mKvdzh1g0qoiM/we5RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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