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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d55617232e1b4f9a7a0a7922dfad83ebef4b31f82f731422db240cb4c6986b' 
  AND token = 'nmAB7dSPIYNECk9/KNyfRk4EwKKsDDwa8/EboXDqu64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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