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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd449e340937b6dc93499fb09e3b7d3eeed6740b1b8d91bc1b8d007319b01a2' 
  AND token = '87xZubgD7kL/088k72IMebXobiJprRL+Ylr/cgG4VRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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