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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd1daecfeace80a0d6a498a49a6458ed80005abd5b2ccf4c8a606fd44533209' 
  AND token = 'TWA1oyIuEUdEfld5BWNazxCqHhPdqMgGo+p0edBURmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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