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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f00812871f076d39d47521c43e7ce75a36f62d320543d9ce2d10fd82114179' 
  AND token = 'sTa+t7Wq2lsFlQ8jMGps2Z80aBWoWOufWlg4gjmKHAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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