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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b9e767a43983b5da414868b37700ef248a9fbce6778bf45d490a5cef962012' 
  AND token = '9Rrgw7SW228Ub8vIDFs88Jqdj4ThH5amBEwcqn/vmhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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