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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02377623a26b88aeaecfe04f91d9b2f077faaee69e78dcbbee1f15b7ef7e6a70' 
  AND token = 'nZNNYyVOyKj2mo5wJIJCHSDJ7IanpzLfOwIPV8JOl1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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