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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b5cd7f3b0e6e2301e00bbf021e99585c2d50a3b51b9e339ecbd16e2d4a01dc' 
  AND token = 'GZIrG0asTPBZxpSoryJ3x6S+AERBqFMm3gERjey3q1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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