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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092499cec0c1d4089ca83050a419779b001bb0051ac0a395e1e7974b109d5c9a' 
  AND token = 'g92XVfeHsePrQYrk7ibzmazTUCZjanJZgp/b2yqD3HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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