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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ab22ef395d258160111c2d4400175e9e699229c60c57fc66829d64507d3468' 
  AND token = 'yui58WhYDOFFhmJXOMb+IB51009PqYl4ZjI4eMQAlTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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