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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63689c6688b8266933b2daf9b87cc97b3418bf960faaab701ede818a78946ea3' 
  AND token = 'wBo5wcCZqdC9hTOCEy4XqSrf6X5CPYZmH2A908ed6QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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