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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295813a7915ea3d7ae3c04c049c452d9939f1478313a3471bd1d157c70ce3cfc' 
  AND token = 'bKiML7H/8MOX82uAQNa5HGRgATZbCz8ES26lPnhYOhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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