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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfffee9ef6f5f7040e83327584fa09b949160926a97043e1fa7b363f15fc1e2c' 
  AND token = 'kAvtRvVPNNgR7CFpRBf6cdmned8ceHhOEmkDibG7nQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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