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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1e66944c81fb4ec888e9d07f24163e556d2eb60eedc8dc0874bc0bc56ec18d' 
  AND token = 'CbaDyJH4N9QI2WGenjji8dde7hWVfk9SxBU0bDBBrno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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