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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73a43cffa8bf029a71af5c4dc940db4569af9131640aa66325a56f8c2f03abf' 
  AND token = '/IAFXhS8jk2HnC/CZCgjFZAukxpm6doaSF8nlRoGMG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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