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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb340f023382b4c7f1b7032ecd385c2d7379c1e9ac7bbbbf46bd9b5833a43f44' 
  AND token = 'EgEVQ42gkmyJiyqppSDVjkKi3jd3B1uPM4+vqoyp0Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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