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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6e5091ff2637e7f476a4668b97a1504fb2d3897b6c93fe33b665130becf757' 
  AND token = 'n/6zbDPYtziN5ivknCZspAWjxd8hqCbca8ScOuLlDNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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