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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f6ea2990d07f154d113e6c3d1971e2e470d1a12621e472d5b799ec0b0ba813' 
  AND token = 'pwnQt+d/k6K5rheek4Jd+6cKxUzNd02fXKfx5gA645c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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