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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62861756729ba71231e8e3a68eb1ba944e14a182066418b421face2f0e053abf' 
  AND token = '9RP1XILx+0ah7DFcgONRgu5P94wM5hLPUazVwXJLXlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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