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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ef7d42efd0eec777c360d56561e86552c1c7705d429f69b782b03c8fbc3696' 
  AND token = 'nbi8Tqc9+IgUvrCATUHXklgN8lIGozFIMcNjz0gCDi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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