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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfaa597c0f5d929d4d6a428af99c337fd76ed43fab105e5ac8e2d7d3f50734ae' 
  AND token = '6Bg6Rk86X58rAmno779KsnSMjEsre8IqiEZVwVHBz/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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